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Sunburn effect (as measured by the UV index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. [9] [10] The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface.
Now that the ozone layer is thinner and the UV Index is used worldwide, it often reaches 15–20 in tropical territory, and 6 is indeed mild by comparison. If they had to start fresh today, I suspect they'd define the scale differently.
The WHO-standard ultraviolet index is a widely publicized measurement of total strength of UV wavelengths that cause sunburn on human skin, by weighting UV exposure for action spectrum effects at a given time and location. This standard shows that most sunburn happens due to UV at wavelengths near the boundary of the UVA and UVB bands.
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The lowest daily maximum temperature is −8.3 °C (17.1 °F) occurring on 3 occasions: 8 January 1841, 4 January 1867 and 12 January 1987. [10] The highest daily minimum temperature recorded is 25.8 °C (78.4 °F), recorded in Kenley on 19 July 2022. [ 11 ]
Reports from these coastal stations and automatic weather logging stations in the British Isles are included in the extended Shipping Forecasts on BBC Radio 4 at 0048 and 0520 local time each day.
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